[R-sig-ME] lme4 error: "Number of levels of a grouping factor . . ."

[Ben Bolker]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On 07/27/2011 03:29 AM, Martin Maechler wrote:
>>>>>> Gabrielle Miller-Messner <gmessner at ucdavis.edu>
>>>>>>     on Tue, 26 Jul 2011 22:26:38 -0700 writes:
> 
>     > Hello, I have count/proportion data and I am trying to
>     > account for overdispersion in a logistic regression. With
>     > the following code from lme4 I receive the following error
>     > message:
> 
>     >> glmm = glmer(cbind(fertilized, unfert) ~ density.class +
>     >                (1|individual), family = binomial) 
>     > Number of levels of a grouping factor for the random effects
>     > is *equal* to n, the number of > observations
> 
>     > This problem was mentioned in Warton and Hui 2011, so I
>     > imagine it may have been fixed recently.  I downloaded the
>     > most recent version of lme4 available through the command
>     > install.packages("lme4").  Is there an updated version of
>     > the package available in a different form?
> 
> {yes, lme4a on R-forge, but that's not the issue now, and not
>  something I'd recommend to get into just right now ...}
> 
> Well, I'm puzzled that you say you get an *error* with the above
> message.
> You should get a message, but no error in the case of glmer().

  Probably this is indeed just a warning message and not an error?
   Gabrielle, does the function return an answer (i.e. a fitted model)?

> 
> 
> Just to be sure:  What does  
>      packageVersion("lme4")
> say for you?
> 
> Martin
> 
> 
>     > I am using R version 2.13.1 on OS 10.6.4.
> 
>     > thank you!  Gabrielle
> 
>     > -- 
>     > Gabrielle Miller-Messner Graduate Student Center for
>     > Population Biology Section of Evolution and Ecology
>     > University of California, Davis 1 Shields Avenue Davis,
>     > California 95616 gmessner at ucdavis.edu
> 
>     > 	[[alternative HTML version deleted]]
> 
>     > _______________________________________________
>     > R-sig-mixed-models at r-project.org mailing list
>     > https://stat.ethz.ch/mailman/listinfo/r-sig-mixed-models
> 
> _______________________________________________
> R-sig-mixed-models at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-sig-mixed-models

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.10 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/

iEYEARECAAYFAk4wE90ACgkQc5UpGjwzenPiQACeJ33UCdFDFRUi3V3wh4VHEk+G
KFMAnjA3LOzKK4pj7VnqbzmYaukQT6FV
=jGz9
-----END PGP SIGNATURE-----